tadded a couple of permeability refs; - sphere - GPU-based 3D discrete element method algorithm with optional fluid coupling
 (HTM) git clone git://src.adamsgaard.dk/sphere
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       ---
 (DIR) commit 3483d6d9a230229c803b778263b77fc5ac4fa5bf
 (DIR) parent 3c02b97e012ec38b83879935c8013603e7380638
 (HTM) Author: Anders Damsgaard <anders.damsgaard@geo.au.dk>
       Date:   Fri, 16 Aug 2013 11:21:51 +0200
       
       added a couple of permeability refs;
       
       Diffstat:
         M src/darcy.cpp                       |       2 ++
       
       1 file changed, 2 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/src/darcy.cpp b/src/darcy.cpp
       t@@ -177,6 +177,8 @@ void DEM::findDarcyTransmissivities()
                        Float phi = d_phi[cellidx];
        
                        // Calculate permeability from the Kozeny-Carman relationship
       +                // Nelson 1994 eq. 1c
       +                // Boek 2012 eq. 16
                        k = a*phi*phi*phi/(1.0 - phi*phi);
        
                        //K = d_K[cellidx];